Answer:
Explanation:
The net force on electron is electrostatic force between electron and proton in the nucleus .
Fc = 
This provides the centripetal force for the circular path of electron around the nucleus .
Centripetal force required = 
So



The answer is C a combustion’s reaction
I'm confused... is there more info?
The one with higher mass has a higher density because it fits more mass into the same amount of space (volume).